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OPERATING SEGMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2017 | Apr. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 368,657 | $ 350,648 | $ 712,089 | $ 656,875
Depreciation | 5,274 | 5,154 | 10,518 | 10,012
Amortization | 9,979 | 10,108 | 19,983 | 19,171
Operating income | 76,542 | 66,794 | 141,092 | 119,415
Capital expenditures | 7,116 | 9,856 | 13,538 | 15,546
Corporate And Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (4,321) | (2,208) | (7,955) | (4,709)
Depreciation | 53 | 56 | 106 | 112
Amortization | 179 | 166 | 344 | 331
Operating income | (7,028) | (7,916) | (12,925) | (13,044)
Capital expenditures | 98 | 88 | 144 | 390
Flight Support Group [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 231,809 | 220,290 | 452,710 | 424,866
Depreciation | 3,128 | 2,974 | 6,276 | 5,924
Amortization | 4,099 | 4,117 | 8,203 | 8,245
Operating income | 44,744 | 41,308 | 86,107 | 76,788
Capital expenditures | 4,688 | 4,710 | 8,560 | 8,415
Electronic Technologies Group [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 141,169 | 132,566 | 267,334 | 236,718
Depreciation | 2,093 | 2,124 | 4,136 | 3,976
Amortization | 5,701 | 5,825 | 11,436 | 10,595
Operating income | 38,826 | 33,402 | 67,910 | 55,671
Capital expenditures | $ 2,330 | $ 5,058 | $ 4,834 | $ 6,741

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